1990000240 has 20 divisors (see below), whose sum is σ = 4626750744. Its totient is φ = 796000064.

The previous prime is 1990000219. The next prime is 1990000241. The reversal of 1990000240 is 420000991.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990000241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12437422 + ... + 12437581.

Almost surely, 2^1990000240 is an apocalyptic number.

1990000240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990000240 is an abundant number, since it is smaller than the sum of its proper divisors (2636750504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1990000240 is a wasteful number, since it uses less digits than its factorization.

1990000240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24875016 (or 24875010 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1990000240 is about 44609.4187364059. The cubic root of 1990000240 is about 1257.8177225091.

The spelling of 1990000240 in words is "one billion, nine hundred ninety million, two hundred forty", and thus it is an aban number.